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"The value of sensor could not be read" error in /var/log/messages file and SNMP Traps about hardware sensors are sent repeatedly
Symptoms
  • /var/log/messages file on Gaia OS repeatedly shows:

    xpand[PID]: The value of sensor could not be read
    last message repeated N times 
    
  • trapd.log file on HP OpenView Network Node Manager Server shows that the following SNMP Traps were sent from the machine at the same time when the sensor errors were printed in the /var/log/messages file:

    • fanFailure;N .1.3.6.1.4.1.2620.1.3000.5.2.1 0
    • voltageChange;N .1.3.6.1.4.1.2620.1.3000.5.3.1 0
  • Traffic capture on Gaia OS shows that the following SNMP Traps are sent:

    • Fan sensor system Fan N : Speed is NotValid, should be XXX-YYY
    • Voltage sensor 'SENSOR_NAME': voltage is NotValid, should be over ZZZ
Cause

By design, SNMP Traps are sent when:

  • value of sensor could not be read
  • value returned by sensor is 0

In this case, SNMP Traps are sent due to incorrect validation of the values returned by sensors.


Solution
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